SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910de91ee69c6c2ac314e6cfb3ab284fddf538747220cab4392434b080744187' 
  AND token = '2HtAh6ggSO/P1PFWQokm02xpw/K81aG0UXVxmIVFcj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}